Improvement in machines for bending tubular sockets



2 Sheets-Sheet. 1.

J. HgALKBR. Machine for Bending Tubular Sockets.

No. 200,595. Patented Feb. 26,1878.

Wusms;

@{Erflar WW. & A K

2 Sheets-Sheet 2.

. J. H. ALKBR. Machine for Bending Tnbular'Sockets.

No. 200,595. Patented Fb.*26, l878.

UNITED "STATES Pn'rnlv'r OFFICE.

JOHN H. ALKER, OF PITTSBURG, PENNSYLVANIA, ASSIGNOR TO JONES &

LAUGHLINS, OF SAME PLACE. I

|MPROVEMEN T IN MACHINES FOR BENDING TUBULAR SOCKETS.

Specification forming part of Letters Patent No.'200,595, dated February26, 1878; application filed December 5, 1877. I

To all whom it may concern:

Be it known that I, JOHN H. ALKER, of Pittsburg, county of Allegheny,State of Pennsylvania, have invented or discovered a new and usefulImprovement in Machines for Bending Tubular Sockets; and I do herebydeclare the following to be a full, clear, concise, and exactdescription thereof, reference being had to the accompanying drawing,making a part of this specification, in which-like letters indicatinglike parts Figure 1, Sheet 1, is a perspective view of my machine fromthe feeding side and contiguous end. Fig. 2, Sheet 2, shows a plan viewof a portion of the operative devices and a horizontal sectional view ofthe mandrel and dies which complete the bend. Fig. 3 is a like view ofthe latter dies, the mandrel, and blank in the position they occupy atthe completion of the bending operation. Fig. 4 shows a verticallongitudinal section of the principal operative parts of the machine.shows a blank sheared off ready for bending, and Figs. 6 and 7 show theresults of the first and second bending operations.

My improved bending-machine is designed for shearing and bending orshaping short tubular metallic articles, such as collars, rings,sockets, and thimbles, preparatory to welding and finishing, whichlatter operations are done in a separate machine and at a subsequenteat.

A frame-work of any suitable construction is shown at A, a crankeddriving-shaft at B, and a connecting-rod at B. The latter is jointed atD to a cross-head, D which latter operates a reciprocating rack, D,which is toothed on both sides, and the teeth of this rack mesh into thesegmental oscillatory gearwheels b b, each mounted on an axial stem,12'. A pair of oscillating die-blocks, d 61, each carrying abending-die, at, having a U-shaped face, are made fast to thegear-wheels b b. The rack D is held in its properline of motion by arigid connection to the cross-head, D and the latter is properly heldand guided by a dovetailed slide, h, on its under face, working betweenand under the guides h.

The shaft B, by an additional crank, B and connecting-rod B transmits anintermitting Fig. 5

oscillatory motion through crank G to a shaft, G, at the opposite end ofthe machine. I This shaft carries and operates a cam, 9 which lattergives an intermittingly forward stroke to a shear-block, g, suchshear-block moving in slides or ways, and carrying on its forward end ashear, s. V A counter-shear affixed to one,

c, of a pair of formers, c c, is represented at 8 is imparted by aspring, g and rod-connection 9 Apair of formers (represented at 0,0)

by any suitable means, as indicated at 8 so that the length of the blankmay be varied at pleasure.

The forward end of the rack D carries a mandrel, e, the lower end ofwhich is of the size and shape of the socket-eye, and which at the timeof feed is forward, or to the right of the plane of feed. The bar thenbeing fed in between the shears, the latter cut off the blank m, and theback-stroke of the rack begins. The lower projecting end of the mandrel0 engages the blank at or about the middle of one side, and, carrying-it back between the formers c 0, brings it to a U form, as shown at nin Figs. 2 and 6. The same back-stroke of the rack also shifts the diesat d from the position shown in Fig. 1 to that shown in Fig. 2. A

continuation of the same motion carries the blank n past the rear endsof the formers c c, and also brings the dies d 01 around, so that theyshall encompass the blank laterally, and close in on the arms of theU-shaped blank, and bend them around the mandrel, as represented at n,Figs. 3 and 7 giving either a butt or lap joint, as may be preferred,provision having been made accordingly in the shearing operation; and,if desired, one die maybe so shaped as to close in one arm of the U alittle in advance of the other when a lap-j oint is to be provided for.With the next forward stroke of the rack the gripe of the dies d will bereleased, and the blank n will fall OK the The reverse motion of themoving shear mandrel through a slit, f, in the-frame of the -machine,-or it will otherwise be forced off by a forked stripper, a, which ispivoted to a post, f and held up by a spring, f, in such position thatwith such next forward stroke of the rack the prongs a will enterbetween the underside of the rackand the top end of the socket-blank,and force the'1latter downjward off the mandrel, the mandrel passinginto the crotch of the stripper-prongs a; but

more perfectly to secure this stripping effect,

I pivot an outwardly-swinging toe, a t0 the end of the rack, and in suchposition that after the stripper-prongs a have engaged the blank the toean, operating onan incline, a on the stripper a, will depress thestripper-prongs a, as indicated in Fig. 4, and so strip off the blank.When the rack Dagain moves back to bend another blank the toe to swingsout- -wardly over theinclinea, so as not then to depress; the stripper.

1 The described machine, by suitablechanges in the-form of the -mandreland di6S,- G&Ilb6 readily adapted to bending and shaping metallic ringsto be weldedonto shanks or stems of tools, so as to form shoulders orcollars thereon; also, for shapingand bending chainlinks and similararticles.

-Where scarfed and lapped ends are required, the form orcutting strokeof the shears. may

.be varied to accomplish. such end, and these, .as well as all. othersimilar 1 modifications of hereinaftersetforth, except that mechanicalequivalents are included.

I claim herein as my invention- 1. A reciprocating toothed rack, D," forcom- -1nunicating an intermittent oscillatory motion in oppositedirections, through gear-wheels b b, to a pair of U-faced bending-dies,d d, in combination with shears m formers 0 0, "and mandrel e,substantially as set forth.

2. Dhe -stripper at, having wedge -shaped prongs a and an incline, ainco1nbination with the swinging toe-aattached to the rack,

substantially as set'forth. a

In testimony whereof I have hereunto set my? hand.

y QJOHNRALKER.

Witnesses:

J l J. MoOoRMIcK, OLAUDIUs L.- PARKER.

